Improvement in extension-scaffolds



aina eine Asnt SWEET, orvvn'sfrrinnn, rENNsYLvANIafAssIeNonfor cnn-HALE HIS RIGHT TOA GEORGE W. GHRISHOLM, OF SAME PLAGE Letters Patent No. 111,094,dated January 17,1871.

IMPROVEMENT 4IN EX-TENSION-SCAFFO-LDS.

The Schedule referred to in these Letters Patent and' making part of thc same.

To (lll 'wh-om it may concern:

Beit known that I, AsEL SWEET, of Westfield, in the county of Tioga and State of Pennsylvania, have invented a new and valuable Improvement in Exteni' sion-Scaffolding Supports; and I do hereby declare that-the following is a full, clear, and exact descrip- -tion of the construction and operation of the same,

reference being had to the annexed drawing, making a part of this specification, and to the letters and gures of reference marked thereon.

`Figure lof the drawing-'is a side view of my invention folded up.

Figure 2 is a side view of bracket.

Figure 3 is a central vertical section.

Figure 4 is a front view.

My invention relates to scaffolds for builders use, and consists iu a novel arrangement of devices intended to serve as a useful apparatus for the purpose named.

The parts marked respectively A, B, and G, upon the drawing, represent extension-bars, of which the parts B andr C have notches formed in theirunder sides, as shownyand all of them have grooves cut in their upper sides extending from end to end, to provide for the security ofthe lifting-rope D, hereinafter mentioned.

E represents ahorizontal base-block for the bar A, I

and into which said bar is framed, as represented.

The letter-a represents a pulley, arranged in the head of bar A; and A c, n, and 1' are similar pulleys, arranged in bur B,.as shown. A

G represents a windl'ass and crank, arranged upon the bar A for thc purpose of operating the liftingrope I). Y

The letters o o represent staples or clamps, pivoted, respectively, to the bars A and B, as shown, and which operate in conjunction with the notches on said bars to hold said bars i`n the positions desired.

I make 'an eye, s, in the end of said clamps, respect' ively, as shown, in which -thetrip-rope 'is affixed, as hereinafter described, and in the manner shown on fig. 3.

H represents the trip-rope, arranged as shown on the drawing, by means of which the clamps c are freed from their notches and the several bars allowed to slide vdownward until they assume the position shown on fig. 1.

The letters T represent ban-dsinclosing the b-.lrs A, B, and C, in the manner shown.

The lifting-ropeD is arranged in my apparatus in the manner shown on' fig. 3, and being operated by means fof thev crank and windlass G, 4the bars B and G are raisedupward at will. y a

K represents the bracket, constructed inthe form shown on Iig. 2, and when in use arranged upon the V top of bar() in thc manner shown on fig. "3.

.It has friction-rollers aafxed to its vertical bar, as shown, and brads h affixed toits horizontal bar. .LheA rollers 'uI serve to facilitate its movement up and down on the side of a building, while the, brads It serve to keep the'platform of boards placed thereon from slipping endwise. v

VI claim as'my invention- The apparatus herein described for sustaining and adj usting a builders scaffold, .when constructed 'with extension-bars A, B, and C, with their pulleys, bracket le, clamps c e, trip-rope H, windlass G, and lifting-A rope D, all constructed, arranged, and operated as set forth.

In testimony that I claim the above I have herennto'subsc-ribed my name in the presence'of two wit nesses.

ASEL SWEET.

Witnesses:

MILTON J. WARNER, J. NEWTON DEXTER. 

